Abstract: This paper presents a case history of an evaluation of failure in the soft soil deep excavation supported by the double row piles. It is concluded that the neglecting of a soft and weak soil zone in the analysis as well as the insufficient stiffness in the supporting structure were the major causes of the failure. Three supporting mitigation approaches were proposed and each approach was examined by the finite element method using hardening soil (HS) model. The mitigation results were also ranked with internal stress and deformation aspects. The actual solution was the combination of Method 1 and Method 2. The construction monitoring data indicated that mitigation solution was successful.

Key words: Double Row Piles, Soft Soil Site, Finite Element Method Analysis, Hardening Soil Model, Internal Force and Deformation, Joint Reinforcement Approach